Marking pen



FIG. 1 is a left front perspective view of a marking pen showing my newdesign;

FIG. 2 is a left side elevational view in an exploded condition;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The ornamental design for a marking pen, as shown and described.